Wood-block paving.



W. H HARVEY. WOOD BLOCK PAVING.

APPLICATION mm) mm 11, was.

Patented 0013.13, 1908.

l/WENTOR W/zL/AM H. HARVEY WITNESSES:

8V v azuaf ATTORNEY y To all whom itwidy concern:

STATES rnrnivtr o IoE,

"'Q L AEM B OF vANoo'uv i ama filed March 11, 1908. Serial No. 420,443.

Be it known that I, WILLIAM H. HARVEY, citizen of the Dominion of Canada, residing at Vancouver, 'inithe Province of Britishv Columbia, Canada, have invented a new and useful Improvement in Wood-Block Paving, of whichthe following is a specification.

1 This inventionielates to a system of laying a wood block paving which is particularly designed to anchor oritie the individual blocks to-the' foundation bed on' which they are laid and to one another whereby the upward creeping or super elevation of the blocks above the general surface of the road is prevented.

The invention also comprises certain subsidiary features whereby the vibration of the road deck of a bridge or trestle structure is lessened and distributed in a manner to avoid disturbance of the blocks- The invention is particularly described in the following specification, reference being made to the drawings by which it is accom panied, in which: I

Figure 1, shows in perspective the successive structure of a bridge or' trestle deck in preparation for block paving and the manner in which the blocks are tied or secured thereto, and Fig. 2, a section through the block paving across the lines in which they are laid.

On the bearers 2 which carry'the road-bed is laid diagonally a foundation deck of timbers 3 l1av1ng an equal dimension of breadth and depth, say if x 4'., the .grain of the wood being normal to the surface of the road-bed These timbers 3 are spiked to the bearers 2 and to one another and are thereafter dressed to an approximately even upper surface. '.On this. foundation, deck planking 4 is laid longitudinally, the planks being planed on one side to insure their being of uniform thickness and are nailed with the planed side down so that the rough upper surface will absorb and retain a' coating of bituminous distillate which is then spread over the surface. On the surface so treated is evenly laid a layer .of tarred felt 5 which adheres to the rough bituminous. surface of'the planking 4, and bituminous distillate is again spread on the upper surface of the layer of felt. This forms the foundation forthe wood blocks 6 of the road-v way which are then laid either across or diagohally with the edge grain square to the surface in the usual manner.

- If Specification of Letters Patent.

n arrisn COLUMBIA, CANADA.

5 Patented ocais, 1908,

Each row of blocks islaid upon a strip-'7 of tarred felt, wire cloth orother suitable strip should be of such a characten as will permit the mixture of bituminous asphalt and oil o f tar '8 with which the blocks are floated to permeate the material and ,ob

tain an adherent'hold of it to the blocks ,-0r

the materialof the strip may be roughened to obtain a positive hold of the blocks in addition to the adherence ofthe asphalt grouting with which they are floated. The blocks are thus secured together andto the road-bed and will resist any tendency to' work up above the general surface of the road under the vibration of passing traflic.

The use of equal dimensioned timbers for the ,solid floor enables the timbers to be placed edge grain without special selection,

in which position they have greater strength and rigidity, and being laid diagonally the undulatory vibrations .due to thepassage of traflic are distributed away fromv the line of movement, while the superposed boarding being laid longitudinallyvits vibration will not coincide with that of the foundation floor and will therefore be more readily neutralized.

The vibrations of the road-bed will thus have a less disturbing eiiect'on the superlaid blocks, while the manner in which those blocks are laid with an underlying and intervening connected strip between each row bedded in a dressing of bituminous material such vibrations as there are-will be unlikely to cause displacement of the.

blocks. 5

The vibration of traflic on a road structure not only tends to work the block's up in places, and particularly so in the case of blocks adjacent to tramway rails, but the vibration disintegrates the bituminous dress ing which is quickly reduced to powder,

when its moisture excluding qualities are destroyed. Underthe structural system of laying just described the vibration is rendered less intense and is further lessened by the layers of felt under and between the paving blocks. This lessening of the vibra tions. alone saves to a large extent the dis-' integratibn of the bituminous coating, but in addition the felt layers being saturated with the oil of tar from the compound with which the blocks are granted maintains the bituminous compound in the semi-plastic state. which 'is most favorable to the exclusion of moisture.

' Having now particularly described my 5 invention and the advantages claimed for it, I'hereby declare that what I claim as new and; desire to be protected in by Letters Patent, is:

1. In a wood block paving, the combination with a roughened surface dressed with a layer of bituminous distillate, of a layer the seams and interstices.

'2. In awood block paving, a foundation of timber arranged diagonally side by side and spiked to one another and to the foundation frame, a layer of planks of gaged thickness and rough upper side nailed to the underlying floor the joints at an angle of approximately 45 to those of the floor heneath, a dressing of bituminous distillate on the upper surface of these boards, a layer of felt evenly spread thereon, a further dressing of bituminous distillate, and wood paving blocks laid on this felt in rows edge grain up with means for securing-the blocks ontheir bed and to one another.

In testimony whereof I have signed my WILLIAM H. HARVEY.

Witnesses:

ROWLAND BRITTAIN, CLIVE S. CARMAN. 

